Logical operators on enums

 

This question already has an answer here:

  • What does the [Flags] Enum Attribute mean in C#? 10 answers

    • If you're going to use the enum as a bitmap like this, then the members need to be given values which use a different bit each: 

    [Flags]
enum MyEnum
{
   Bold = 0x01,
   Italic = 0x02,
   Underlined = 0x04,
   Struck = 0x08
}

    By default, they've been given the numbers 0,1,2,3 - the first does nothing, and the second two overlap with the last.

    As mentioned in the comments, you should also add the [Flags] attribute to the enum definition, so that if you do ToString() you get a properly formatted result (and so that everybody knows how you're using the enum) - if won't affect the way it works if you don't, though.

    你正在使用按位运算符，这就是他们所做的

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